Ethanol → Ethyl 5-ethoxy-1H-pyrazole-3-carboxylate

반응식

[CH2:1]([O:3][C:4](=[O:12])[CH2:5][C:6](=O)[C:7](Cl)(Cl)Cl)[CH3:2].[NH2:13][NH2:14].Cl.[CH3:16][CH2:17][OH:18]>>[CH2:1]([O:3][C:4]([C:5]1[NH:13][N:14]=[C:7]([O:18][CH2:17][CH3:16])[CH:6]=1)=[O:12])[CH3:2]

참가 물질

반응물 3

HCID 702Ethanol

HCID 77294Ethyl 4,4,4-trichloro-3-oxobutyrate

HCID 115031Hydrazinium chloride

생성물 1

HCID 68571888Ethyl 5-ethoxy-1H-pyrazole-3-carboxylate

실험 절차

4,4,4-Trichloro-3-oxo-butyric acid ethyl ester (Int 8, 1 eq) and H2NNH2.HCl (1.1 eq) are mixed in EtOH. The resulting mixture is refluxed overnight. The mixture is then evaporated and the obtained crude is purified by chromatography to give Int 9 and 5-ethoxy-2H-pyrazole-3-carboxylic acid ethyl ester (Int 10).